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fd: Comment file_desc_ops

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Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov 2013-04-16 14:47:10 +04:00
parent 8f5b093c5b
commit f34d63bfb1
1 changed files with 18 additions and 0 deletions
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18
include/files.h
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@ -53,10 +53,28 @@ static inline int fdinfo_rst_prio(struct fdinfo_list_entry *fd_a, struct fdinfo_
}
struct file_desc_ops {
/* fd_types from protobuf/fdinfo.proto */
unsigned int type;
/*
* Opens a file by whatever syscall is required for that.
* The returned descriptor may be closed (dup2-ed to another)
* so it shouldn't be saved for any post-actions.
*/
int (*open)(struct file_desc *d);
/*
* Called on a file when all files of that type are opened
* and with the fd being the "restored" one.
*/
int (*post_open)(struct file_desc *d, int fd);
/*
* Report whether the fd in question wants a transport socket
* in it instead of a real file.
*/
int (*want_transport)(FdinfoEntry *fe, struct file_desc *d);
/*
* Helps determining sequence of different file types restore.
* See the prepare_fds for details.
*/
struct list_head * (*select_ps_list)(struct file_desc *, struct rst_info *);
};